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Cupro CB

Cupro B2

Copper Alloy with the Highest Hardness, Hard Copper Alloy

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Description

Cupro B2 is a copper alloy with the highest hardness.
Very high mechanical properties with a reasonably good thermal and electrical conductivity.
Nitriding and case-hardening are not suitable.

ElectricalFastenersIndustrialOrdnanceOther
Belleville WashersBoltsBearingsFiring PinsTools
ClipsFastenersBellows
ConnectorsLock WashersBourdon Tubes
Contact BridgesRetaining RingsBushings
Electrical Switch and Relay BladesRoll PinsDiaphragms
Fuse ClipsScrewsFlexible Metal Hose
Navigational InstrumentsWashersHousings for Instruments
Relay PartsNon Sparking Safety Tools
Spring Connectors, Current CarryingPump Parts
Switch PartsPumps
Rolling Mill Parts
Shafts
Spline Shafts
Springs
Springs, Electrochemical
Valve Seats
Valve Stems
Valves
Wear Plates on Heavy Equipment
Welding Equipment

COMMON FABRICATION PROCESSES

COMMON FABRICATION PROCESSES

  • Blanking
  • Drawing
  • Drilling
  • Forming and Bending
  • Tapping
  • Turning
CHEMICAL COMPOSITION

CHEMICAL COMPOSITION

Elements
Cu(1,2) Al Be Co(3) Si
(1) Cu + Sum of Named Elements 99.5% min.
(2) Cu value includes Ag.
(3) Ni + Co 0.20% min.: Ni + Fe + Co 0.6% max.
Min (%) 1.80 0.20
Max (%) Rem 0.20 2.00 0.20
MECHANICAL PROPERTIES

MECHANICAL PROPERTIES

Form Temper Temper Code Tensile Strength
(ksi)		 YS-0.2% Offset
(ksi)		 Elongation
(%)		 Rockwell B scale Rockwell C scale Rockwell 30T scale Torsion Modulus
(ksi)		 Fatigue Strength**
(ksi)		 Section Size
(in)
* Measured at room temperature, 68°F (20°C).** Fatigue Strength: 100 x 106 cycles, unless indicated as [N] x 106.
Flat Products 1/2 Hard and Precipitation Heat Treated TH02 195 Typ 175 Typ 3 Typ 41 Typ 44 Typ 0.188
1/4 Hard and Precipitation Heat Treated TH01 185 Typ 165 Typ 4 Typ 40 Typ 40 Typ 0.188
Hard and Precipitation Heat Treated TH04 200 Typ 180 Typ 2 Typ 42 Typ 45 Typ 0.188
Mill-hardened Temper, TM – 1/2 Hard TM02 128 Typ 105 Typ 15 Typ 27 Typ 0.188
Mill-hardened Temper, TM – 1/2 Hard TM00 105 Typ 82 Typ 20 Typ 27 Typ 0.188
Mill-hardened Temper, TM – 1/2 Hard TM01 115 Typ 92 Typ 17 Typ 23 Typ 0.188
Mill-hardened Temper, TM – Hard TM04 142 Typ 122 Typ 12 Typ 32 Typ 0.188
Mill-hardened Temper, TM – SHM TM05 150 Min 125 Min 9 Min 31 Min
Mill-hardened Temper, TM – XHMS Spring TM08 182 Typ 160 Typ 6 Typ 0.188
Mill-hardened Temper, TM -XHM – Extra Hard TM06 168 Typ 148 Typ 7 Typ 37 Typ 0.188
Precipitation Hardened TF00 175 Typ 155 Typ 6 Typ 38 Typ 36 Typ 0.188
Solution Heat Treated TB00 70 Typ 32 Typ 45 Typ 60 Typ 58 Typ
Solution Heat Treated and Cold Worked: 1/2 Hard TD02 92 Typ 82 Typ 15 Typ 92 Typ 77 Typ 0.188
Solution Heat Treated and Cold Worked: 1/4 Hard TD01 80 Typ 70 Typ 25 Typ 80 Typ 70 Typ 0.188
Solution Heat Treated and Cold Worked: Hard TD04 110 Typ 104 Typ 5 Typ 99 Typ 81 Typ 0.188
Rod Hard and Precipitation Heat Treated TH04 205 Typ 160 Typ 2 Typ 42 Typ 0.375
Hard and Precipitation Heat Treated TH04 200 Typ 155 Typ 2 Typ 41 Typ 0.375
Hard and Precipitation Heat Treated TH04 195 Typ 145 Typ 4 Typ 41 Typ 7.3 Typ 3
Precipitation Hardened TF00 182 Typ 130 Typ 3 Typ 39 Typ 55 Typ 3
Precipitation Hardened TF00 182 Typ 145 Typ 4 Typ 39 Typ
Solution Heat Treated TB00 72 Typ 20 Typ 20 Typ 65 Typ
Solution Heat Treated and Cold Worked: Hard TD04 110 Typ 75 Typ 8 Typ 95 Typ 0.375
Solution Heat Treated and Cold Worked: Hard TD04 103 Typ 75 Typ 8 Typ 94 Typ 3
Solution Heat Treated and Cold Worked: Hard TD04 108 Typ 75 Typ 8 Typ 95 Typ 1
Wire 1/2 Hard and Precipitation Heat Treated TH02 200 Typ 185 Typ 1 Typ
1/4 Hard and Precipitation Heat Treated TH01 190 Typ 175 Typ 2 Typ
3/4 Hard and Precipitation Heat Treated TH03 210 Typ 195 Typ 1 Typ
Hard and Precipitation Heat Treated TH04 212 Typ 195 Typ 1 Typ
Precipitation Hardened TF00 178 Typ 160 Typ 3 Typ
Solution Heat Treated TB00 68 Typ 28 Typ 35 Typ
Solution Heat Treated and Cold Worked: 1/2 Hard TD02 122 Typ 100 Typ 5 Typ
Solution Heat Treated and Cold Worked: 1/4 Hard TD01 102 Typ 82 Typ 10 Typ
Solution Heat Treated and Cold Worked: 3/4 Hard TD03 142 Typ 120 Typ 2 Typ
Solution Heat Treated and Cold Worked: Hard TD04 152 Typ 125 Typ 1 Typ
PHYSICAL PROPERTIES

PHYSICAL PROPERTIES

Melting Point – Liquidus°F 1800
Melting Point – Solidus°F 1590
Densitylb/cu in. at 68°F 0.29
Specific Gravity 8.26
Electrical Conductivity% IACS at 68°F 22 (1)
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 62 (2)
Coefficient of Thermal Expansion 68-57210 to -6 power per °F (68 – 572°F) 9.9
Specific Heat CapacityBtu/ lb /°F at 68°F 0.1
Modulus of Elasticity in Tensionksi 18500
Modulus of Rigidityksi 7300
FABRICATION PROPERTIES

FABRICATION PROPERTIES

Technique Suitability
Soldering Good
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Good
Coated Metal Arc Welding Good
Spot Weld Good
Seam Weld Fair
Butt Weld Fair
Capacity for Being Cold Worked Good
Capacity for Being Hot Formed Excellent
Forgeability Rating 40
Machinability Rating 20
APPLICABLE SPECIFICATIONS

APPLICABLE SPECIFICATIONS

Form Specific Sub-Form Application System Standard Description
Bar AMS 4533 COPPER BERYLLINUM ALLOY BARS AND RODS, SOLUTION AND PRECIPITATION HEAT TREATED
AMS 4534 COPPER BERYLLIUM ALLOY BARS AND RODS, SOLUTION HEAT TREATED, COLD WORKED AND PRECIPITATION HEAT TREA
AMS 4651 COPER-BERYLLIUM ALLOY BARS AND RODS, HARD TEMPER
AMS 4650 COPPER-BERYLLIUM ALLOY BARS, RODS AND FORGINGS, SOLUTION HEAT TREATED
ASTM B196/B196M COPPER BERYLLIUM ALLOY ROD AND BAR
SAE J463 WROUGHT COPPER AND COPPER ALLOYS
ASTM B194 COPPER BERYLLIUM ALLOY PLATE, SHEET, STRIP, AND ROLLED BAR
MILITARY MIL-C-21657 COPPER-BERYLLIUM ALLOY, LOW MAGNETIC EFFECT (FOR SPECIAL PURPOSE TOOLS AND EQUIPMENT)
SAE J461 WROUGHT AND CAST COPPER ALLOYS
Extrusions Extrusions ASTM B570 COPPER-BERYLLIUM ALLOY FORGINGS AND EXTRUSIONS
Forgings AMS 4650 COPPER-BERYLLIUM ALLOY BARS, RODS AND FORGINGS, SOLUTION HEAT TREATED
Forgings ASTM B570 COPPER-BERYLLIUM ALLOY FORGINGS AND EXTRUSIONS
Plate AMS 4530 COPPER-BERYLLIUM ALLOY SHEET, STRIP, AND PLATE – SOLUTION TREATED
ASTM B194 COPPER BERYLLIUM ALLOY PLATE, SHEET, STRIP, AND ROLLED BAR
Rod AMS 4650 COPPER-BERYLLIUM ALLOY BARS, RODS AND FORGINGS, SOLUTION HEAT TREATED
AMS 4533 COPPER BERYLLINUM ALLOY BARS AND RODS, SOLUTION AND PRECIPITATION HEAT TREATED
MILITARY MIL-C-21657 COPPER-BERYLLIUM ALLOY, LOW MAGNETIC EFFECT (FOR SPECIAL PURPOSE TOOLS AND EQUIPMENT)
SAE J463 WROUGHT COPPER AND COPPER ALLOYS
SAE J461 WROUGHT AND CAST COPPER ALLOYS
ASTM B196/B196M COPPER BERYLLIUM ALLOY ROD AND BAR
AMS 4534 COPPER BERYLLIUM ALLOY BARS AND RODS, SOLUTION HEAT TREATED, COLD WORKED AND PRECIPITATION HEAT TREA
AMS 4651 COPER-BERYLLIUM ALLOY BARS AND RODS, HARD TEMPER
Shapes AMS 4650 COPPER-BERYLLIUM ALLOY BARS, RODS AND FORGINGS, SOLUTION HEAT TREATED
Sheet ASTM B194 COPPER BERYLLIUM ALLOY PLATE, SHEET, STRIP, AND ROLLED BAR
AMS 4530 COPPER-BERYLLIUM ALLOY SHEET, STRIP, AND PLATE – SOLUTION TREATED
AMS 4532 COPPER BERYLLIUM ALOY SHEET AND STRIP, HALF-HARD
Strip AMS 4532 COPPER BERYLLIUM ALOY SHEET AND STRIP, HALF-HARD
ASTM B888/B88M COPPER ALLOY STRIP FOR USE IN MANUFACTURE OF ELECTRICAL CONNECTORS OR SPRING CONTACTS
ASTM B194 COPPER BERYLLIUM ALLOY PLATE, SHEET, STRIP, AND ROLLED BAR
SAE J463 WROUGHT COPPER AND COPPER ALLOYS
SAE J461 WROUGHT AND CAST COPPER ALLOYS
AMS 4530 COPPER-BERYLLIUM ALLOY SHEET, STRIP, AND PLATE – SOLUTION TREATED
Tube AMS 4535 COPPER BERYLLIUM ALLOY MECHANICAL TUBING, SOLUTION AND PRECIPITATION HEAT TREATED
ASTM B643 COPPER-BERYLLIUM ALLOY SEAMLESS TUBE
Wire SAE J461 WROUGHT AND CAST COPPER ALLOYS
ASTM B197/B197M COPPER BERYLLIUM ALLOY WIRE
SAE J463 WROUGHT COPPER AND COPPER ALLOYS
AMS 4725 COPPER-BERYLLIUM ALLOY WIRE – SOLUTION HEAT TREATED